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Up to three tools. The table shows the data as-is, without picking a “best”.
| Field | D2 | Lychee | ntfy |
|---|---|---|---|
| Platforms | Universal | Universal | Universal |
| Local support | Yes | Yes | Yes |
| Paid API | No | No | No |
| License | MPL-2.0 | MIT OR Apache-2.0 | Apache-2.0 / GPL-2.0 |
| Stars | 25761 | 4065 | 35173 |
| Last activity | October 11, 2026 | October 26, 2026 | September 29, 2026 |
| Install complexity | Easy with a supported package manager; Homebrew must already be installed for this command. Official binaries, Windows, Linux, and source options are documented. | — | سهل للتجربة، متوسط للاستضافة الآمنة / Easy to try, moderate to self-host securely |
| Category | Workflow, UI | Testing, Workflow | Workflow, DevOps |
| Best use | For developers and small teams that want architecture and data-flow diagrams close to the repository and reviewable as text. Use it when relationships matter more than pixel-perfect placement; not for free-form marketing design or exact manual positioning. | For documentation authors and small teams checking references locally or in CI. Start with a specific file and interpret findings; it does not establish complete site or login functionality. | Best for an individual developer or small team that wants backup, deployment, and scheduled-job alerts without building a notification app. It starts with one HTTP request and can be self-hosted with users and ACLs. It is not a complete incident-management or log-retention system. |